There is a fine line between being a good marketer to get your message out there and being annoying and unpleasant to talk to. I think most "multilevel marketers" cross that line.
I am also not at all comfortable with recommending that people join an MLM. You can dress these programs up all you want, but ultimately they're just pyramid schemes. They will deny it and give various reasons, but it's always the same thing. Most of the money is made when people sign up and pay for their membership/product/whatever. Some of them may actually be good, but the vast majority exploit people and their desire to be wealthy.
Get your marketing expertise a different way. BP is a great resource. There are plenty of books you can read. Don't join MLMs to learn marketing, because you will learn to market the wrong way and end up calling up old friends asking if they want to get in on an "amazing opportunity" (I cringe every time I receive one of those calls)
Just my two cents. There is ABSOLUTELY merit in letting people know what you do and getting your name out there. You just don't want to cross the line. I think Bigger Pockets should be a place free of pyramid schemes.